from statistics import mean

t = [16.8, 20.5, 10.1, 16.0, 12.6, 15.7, 13.1, 21.1, 11.4, 12.5, 25.3, 11.6, 12.8, 11.2, 14.4, 12.9, 12.1, 10.7, 10.3, 21.7, 17.6, 13.2, 12.7, 17.4]
print(mean(t), sum(t), sum(t)/2)

t = [15.4, 12.0, 20.9, 11.5, 17.7, 18.8, 29.0, 13.4, 15.3]
print(mean(t), sum(t))